/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/TransformProxy.h
This delegate is fired whenever the transform changes in a way that updates the contained components. I.e., SetTransform is called with bSetPivotMode being false.
typedef TMulticastDelegate_TwoParams< void, [UTransformProxy](API\Runtime\InteractiveToolsFramework\BaseGizmos\UTransformProxy) *, FTransform > FOnTransformChanged